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Agua Caliente in Roy Drachman Park flows at 86 degrees Fahrenheit with confirmed USGS measurements at 30 Celsius (86°F), containing 176 mg/L sulfate and other dissolved minerals. This county-managed thermal spring near Tanque Verde sits at 2,750 feet elevation in southern Arizona's Sonoran Desert.
The spring emerges just 76 meters from the nearest road in a protected regional park setting. Visitors encounter desert vegetation adapted to minimal rainfall, with the warm mineral-rich water creating a stark contrast to the arid surroundings. The landscape provides dramatic views of desert mountains and bajadas.
History of Agua Caliente
The hot water results from deep circulation through fault zones in the Basin and Range geology underlying southern Arizona. The Sonoran Desert location has supported human use of these springs for centuries, and the regional park designation ensures conservation of this thermal resource.
Park access is open and roadside-convenient, located within a protected county recreation area. The warm water and mineral content make comfortable soaking possible year-round, though winter months offer the most pleasant visiting conditions in the desert.
Is Agua Caliente worth visiting?
Best for
- Warm-water soaking
- Easy day trips
- Overnight camping trips
Agua Caliente is well suited for warm-water soaking and easy day trips.
Annual Precip: 11.6 in
Annual Snow: 2.0 in
December
Air 51°F · Water 86°F · +35° contrast
January
Air 52°F · Water 86°F · +34° contrast
February
Air 55°F · Water 86°F · +31° contrast
December offers 38°F more contrast than June
Recent Temperature
86.0°F
(30.0°C)
Measured Feb 05, 1942
Overview
Visitors are drawn to Molino Campground for its group camping area, scenic mountain surroundings and hiking and mountain biking opportunities. While most other campgrounds in the Catalina Mountains are closed in winter, Molino Campground and its picnic area are open in late fall, winter and early spring. The pleasant winter weather at this elevation makes it a great time to visit.
Molino Basin is conveniently located 5.5 miles from the base of Mt. Lemmon on the Catalina Highway, and...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Sun protection
Limited shade in warm climate
Camping gear
Nearby camping at Molino
Trash bag
Pack out what you pack in
0 miles from Tanque Verde, AZ
USGS Quad: BELLOTA RANCH 15 · NOAA: 6.0 · AMS Map: TUCSON
What is the water temperature at Agua Caliente?
Agua Caliente has a water temperature of 86°F (30°C). This is a warm thermal spring.
Where is Agua Caliente located?
Agua Caliente is located in Pima County, Arizona at 2,750 feet elevation, near Tanque Verde. Coordinates: 32.2810°N, 110.7300°W.
How do I get to Agua Caliente?
Agua Caliente has Roadside road access (250 ft from the road).
Is Agua Caliente free to visit?
Agua Caliente has Open access. It is managed by CNTY.
Can I camp near Agua Caliente?
Yes, Molino is located nearby (4.2 miles away).
Is it safe to soak at Agua Caliente?
Agua Caliente is generally safe for soaking at its recorded temperature. Always tell someone your plans before visiting remote hot springs.
Is Agua Caliente crowded?
Agua Caliente is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to Agua Caliente?
Essentials for Agua Caliente: swimsuit, towel, water bottle, sun protection (hat, sunscreen), camping gear, a trash bag to pack out what you pack in.